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Sagina subulata is one of the best low growing ground covers. Irish moss is most often used as a ground cover, softening paths and stepping-stones. It gives a lush accent to rock garden and terraces. For a luxurious carpet of green, few plants can match Irish Moss.

Salvia argentea is prized for its spectacular, large, furry silver-grey leaves. The plants form an attractive mound that provide a dramatic background for colourful summer flowers. It complements purple or magenta flowers and looks gorgeous in a ‘white’ garden.

Salvia farinacea ‘Fairy Queen’ is an attractive new variety that bears multiple spikes of bicolour blue and white flowers on dark distinctive flower stems from June to October. With a bushy, compact habit and thick stems. A small white spot on each sapphire blue flower creates the illusion of fairy dust.

Deep, true blue is a highly sought after colour in flowers and are this plants' outstanding feature. Flowering in less than four months, this is a splendid variety, a bushy base branching plant producing numerous, long-lasting spikes of vivid true blue flowers.

Salvia Victoria White is a companion to the more well known Victoria Blue. Flowering in less than four months from seed, it produces its white flowers from summer to autumn. Like all Salvia, it brings butterflies into the garden by the dozen, and makes a wonderful cut or dried flower.

Salvia sclarea var. turkestanica 'Vatican White' is a choice white cultivar that is not that easy to find. A nobly architectural Sage, each of its branched stems is topped with a profusion of lilac-white blossoms and brilliant white bracts. The flowers are attractive and are boosted in impact by the large petioles that surround them.

This hardy biennial Sage has been grown in almost every botanical sanctuary in human history and has many plus points: it grows well in poor soil resists slugs and other beasties, and doesn’t slump or need staking. It copes well in sun or light shade and the blooms are a magnet for bees and butterflies.

This hardy biennial Sage has been grown in almost every botanical sanctuary in human history. Each stem is topped with a profusion of pale blue blossoms and large pinkish white bracts. A truly architectural plant. Organic Seed.

Salvia verticulata 'Purple Fairy Tale' is a spectacular first year flowering perennial. The irresistible deep purple petals gather like raindrops in tiered pools to form whorled flowers. Easy to grow, it will begin to bloom just a couple of months after sowing. The plant flowers abundantly and continues right through to September

Showing off its large, intensely coloured bracts from summer through to autumn, Salvia viridis 'Blue Monday' is an easy and vigorous annual that produces spires of flowers, encased in intensely violet-blue bracts. For a long season of colour, try this annual sage in your containers or in your garden. It won't disappoint.

Salvia viridis is one of the most rewarding and most colourful plants in the summer garden. 'Pink Sundae' produces spires of flowers with pink bracts. The flowers attract bees and butterflies and the stems make excellent and long-lasting cut flowers that hold their colour well when dried, addding to more permanent displays inside the house.

Prized by gardeners for its spectacular display, Salvia viridis provides a welcome vertical accent to the garden. 'White Swan' produces spires of flowers, that are encased in very showy, clearly-veined, white bracts. As a hardy annual, they are easy to grow, simply sow directly where they are to grow, in autumn or spring.

Blue Queen is one of the finest Salvias we know. This plant is a spectacular source of dark, intense colour and narrow, vertical form. Masses of pencil-thin, vibrantly colourful bloom spires, so densely set that they present a solid wall of colour in the border.

The royal sister of ‘Blue Queen’, ‘Rose Queen’ is a wonderful, long-blooming cultivar with slender spires and beautiful mulberry-rose flowers, which open from dark pink buds in early and mid-summer. This tall, easy-to-grow variety with lance-shaped green leaves possess a pleasant aromatic scent.

Sanguisorba officinalis is a native of Europe and an old-world herb that is currently enjoying a resurgence in popularity thanks to the revival of interest in perennial gardens and naturalised form of planting. Perfect for natural style planting schemes, it looks right at home in a swaying sea of grasses.

Sanguisorba convey a relaxed feel to the garden, indispensable to the modern gardener, but it is the summer when the unusual red flowers top the slender, upright stems that it really becomes a head-turner. Easy to grow, they are happiest in a sunny spot where the soil stays moist. Organic Seed.

This Japanese species of Burnet has infiltrated our psyche and somehow manipulated us so that we can find no fault with this most refined of perennials. Flowering in the first half of summer, the highly tactile flowers float like dainty ghosts at the tips of their slender stems.

Santolina or lavender cotton is a small shrub with soft, woolly, finely divided foliage, that make neat, rounded bushes. They are valuable for mass planting, ideal for knot gardens and small hedging around herb gardens etc. It will stand any amount of clipping and shaping - a perfect plant for control freaks.

Saponaria is a pretty little plant that forms a mound of bright-green leaves, smothered by starry bright-pink clusters of flowers. Use as a ground cover, in paving or rock features or allow it to trail over the sides of raised beds and low walls. RHS Award of Garden Merit.

Cleanliness is next to godliness even in history. For centuries Saponaria officinalis has helped keep us clean while providing a little loveliness in our gardens. The flowers are an important nectar source and emit a pleasant and intriguing clove-like scent, seducing both night moths and butterfly species.

"Floral Carpet" has flowers in shades of red, pink and rose. These evergreen, cushion-forming perennials are compact, free-flowering, and easily raised from seed. Plants quickly form a verdant mat. The surface-spreading mossy leaves are evergreen for year-round effect.

Saxifraga x arendsii 'Purple Robe' are compact, free-flowering, and easily raised from seed. These charming perennials quickly form an evergreen verdant mat. Excellent as alpine plants for a rockery or trough, use them spilling over low walls, as a path edging or green roof.

These charming perennials become a lovely groundcover in a short time, the surface-spreading mossy leaves form compact cushions of foliage and are evergreen for year-round effect. Saxifrage Spring Snow, with small white, cup-shaped flowers are compact, free-flowering, and easily raised from seed.